Studies showing dog deaths spike in the 70’s, better reporting? More dogs? The introduction of Glyphosate?
Cyanobacteria (also called blue-green algae) are ubiquitous in aquatic environments. Some species produce potent toxins that can sicken or kill people, domestic animals, and wildlife. Dogs are particularly vulnerable to cyanotoxin poisoning because of their tendency to swim in and drink contaminated water during algal blooms or to ingestalgal mats.
The whole story: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3798876/